LANG.CAST.ARRAY.POINTER : Array to Pointer Decay

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An identifier with array type is passed as a function argument and decays to a pointer.

Class Name

Array to Pointer Decay

Significance

style

Mnemonic

LANG.CAST.ARRAY.POINTER

Categories

AUTOSARC++14	AUTOSARC++14:M5-2-12	An identifier with array type passed as a function argument shall not decay to a pointer.
	AUTOSARC++14:A18-1-1	C-style arrays shall not be used.
MisraC++2008	MisraC++2008:5-2-12	An identifier with array type passed as a function argument shall not decay to a pointer.
MisraC++2023	MisraC++2023:7.11.2	An array passed as a function argument shall not decay to a pointer
JSF++	JSF++:183	Every possible measure should be taken to avoid type casting.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Array to Pointer Decay"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

int ptr_arg(int *p);
int no_dimensionality(int a[5]);
int dimensionality_preserved(int (&a)[5]);

int lang_cast_array_pointer() {
   int retval=0;
   int myarr[5];

   retval += ptr_arg(myarr);                  /* 'Array to Pointer Decay' warning issued here */
   retval += no_dimensionality(myarr);        /* 'Array to Pointer Decay' warning issued here */
   retval += dimensionality_preserved(myarr);                       /* ok: myarr does not decay to a pointer */

   return retval;
}

The following configuration file parameters affect checks for this warning class.

LANG.CAST.ARRAY.POINTER : Array to Pointer Decay

Summary

Properties

Example

Relevant Configuration File Parameters